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z in (-oo:+oo)
1.8/2 = z/3 // - z/3
1.8/2-(z/3) = 0
0.9-1/3*z = 0 // - 0.9
-1/3*z = -0.9 // : -1/3
z = -0.9/(-1/3)
z = 2.70000003
z = 2.70000003
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